docs: def append_annotation(self, annotation: str, values: Set[str]) -> 'Seeding':
          """Add a seed induction method for single annotation's values.
  
          :param annotation: The annotation to filter by
          :param values: The values of the annotation to keep
          :returns: self for fluid API
          """
          return self._append_seed(SEED_TYPE_ANNOTATION, {
              'annotations': {
                  annotation: values,
              }
          })